8mm Forum: Da Lite Screen types

This is topic Da Lite Screen types in forum 8mm Forum at 8mm Forum.

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Posted by Hal Dickens (Member # 3661) on April 24, 2013, 10:49 PM:

Sorry if this question has been posted before.
What percentage of you prefer glass beaded or matte screens? I've always loved the glass beaded ones myself.

Posted by Maurice Leakey (Member # 916) on April 25, 2013, 03:18 AM:

The answer depends on the shape of your viewing area. A glass beaded screen will throw back a very brilliant reflection but only works well in a long and narrow situation, whilst the white screen reflects the light evenly up to 50 degrees from the centre line.

The following table shows the proportion of light reflected (assuming 100% from Beaded at normal) with the angle from the normal centre line.

0 degrees...Beaded 100%..Silver 84%..White 35%
20 degrees..Beaded 38%...Silver 42%..White 32%
50 degrees..Beaded 16%...Silver 7%...White 20%

You will see that a silver surface is also mentioned which may interest members.

I acknowlege that these figures come from "Cine-Film Projection" by C.A. Hill.

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